Finally, fully interactive drawing is now live.
You can left-click to spawn cells and right-click to wipe them out on the fly.

Added a proper pause state on Spacebar too, so you can stop time, comfortably sketch out gliders, spaceships, or any complex structures, and then let them loose.

Also made the window fully resizable, which means you can just hit the square icon to maximize it, or press F11 for a true borderless fullscreen. Had a bit of a nightmare with Windows loop-crashing the resolution scaling at first, but it is completely fixed now.

The grid dynamically auto-adjusts to whatever screen size you throw at it, keeping your current shapes intact while filling the new empty space with random chaos.